First commit after migration from isa repository.

bugfix:
    - fixed css on keyboard: added important attribute
    - fixed css on keyboard: added important attribute
    - fixed attribute of html element "input": now is supported the "email" value
    - ISA addon remain enabled clicking on status bar icon (active/deactive) =  fixed with new method to verify statew of variable "enabled"
    - ISA disabled when click on input with class="isa_writtentext" to avoid recursive activation on ISA website

code refactor:
    - better management of CSS file: not injected in html page but registered by the extension to avoid style rules override
    - better performance detecting click on target element and controlling source of click (to avoid action in ISA web page)
    - deleted unused variables and controls
    - deleted jscript utils.js: now the extension modify DOM internally avoiding script injection
    - isadiv.html page pass value to extension using a new attribute (val) to avoid collision between jscript
    - added new listeners on all isaDIV to substitute external jscript
    - better recognition of ISA WEB  page and iframe used by "ISA Browse" function
    - div created reading from isadiv.html page
    - renamed class, method, css ref and element id

style refactor:
    - activated close button and enter button

new feature:
    - implemented autosubmit when user click on button "enter" in an element "input" = click raise a keyboard event

css
    - background color modified on keyboard div

html
    - removed last isa_row unused

- modified layout of keyboard = added cursor
- image and css - now is identical to ISA web page

TODO: created skeleton for parsing function to implement jump to next input